Transcript The Circulatory System - Blountstown Middle School

The Circulatory System
Transportation system by which
oxygen and nutrients reach the
body's cells, and waste materials
are carried away.
Also carries substances called
hormones, which control body
processes, and antibodies to
fight invading germs.
www.biosbcc.net/doohan/ sample/htm/heart.htm
Parts of the Circulatory System
• Divided into three major parts:
– The Heart
– The Blood
– The Blood Vessels
The heart, the lungs, and the
blood vessels work together to
form the circle part of the
circulatory system.
Circulation
• Two parts
• Heart acts as double pump
• Blood from the right side pump is dark red
and low in oxygen (oxygen-poor)
Circulation
• Travels through pulmonary arteries to
lungs where it gets fresh oxygen and
becomes bright red
• Blood from lungs through pulmonary veins
back to the heart's left side pump
• Pumped out into the body
http://users.tpg.com.au/users/amcgann/body/circulatory.html
sln.fi.edu/biosci/systems/ pulmonary.html
http://sln.fi.edu/biosci2/systems/
Blood Vessels
Hollow tubes that circulate your blood
Three Kinds of Blood Vessels
• Arteries
• Veins
• Capillaries
Arteries
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Carry blood AWAY from the heart
Heart pumps blood
Main artery called the aorta
Aorta divides and branches
Many smaller arteries
Each region of your body has system of
arteries supplying it with fresh, oxygen-rich
blood.
Arteries
• Tough on the outside
• Smooth on the inside
• Muscular wall helps the heart pump blood
Have strong, muscular walls
The inner layer is very smooth so that the blood
can flow easily
http://hes.ucf.k12.pa.us/gclaypo/circdia.html
http://sln.fi.edu/biosci/systems/circulation.html
Capillaries
• Very thin
• Only one cell thick
• Connect arteries & veins
Capillaries
• Food and oxygen released to the body
cells
• Carbon dioxide and other waste products
returned to the bloodstream
http://sln.fi.edu/biosci/systems/circulation.html
w3.uokhsc.edu
Valves are located inside the veins. The valves
only allow blood to move in one direction.
http://hes.ucf.k12.pa.us/gclaypo/circdia.html
http://users.tpg.com.au/users/amcgann/body/circulatory.html
Veins
• Carry blood to the heart
• Receive blood from the capillaries
• Transport waste-rich/ oxygen-poor blood
back to the lungs and heart
• Valves are located inside the veins
• Allow blood to move in one direction
http://sln.fi.edu/biosci/systems/circulation.html
The Heart
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Size of your fist
Thick muscular walls
Divided into two pumps
Each pump has two chambers
Upper chamber - atrium receives blood
coming in from the veins
• Lower chamber - ventricle squeezes blood
out into the arteries
http://hes.ucf.k12.pa.us/gclaypo/circdia.html
Blood
• Pumped by your heart.
• Travels through thousands of miles of
blood vessels
• Carries nutrients, water, oxygen and waste
products to and from your body cells.
• Made up of liquids, solids and small
amounts of oxygen and carbon dioxide.
Blood
• Red blood cells carry oxygen from the
lungs to all the cells of the body.
• Takes carbon dioxide and transports it
back to the lungs
• About 5,000,000 Red Blood Cells in ONE
drop of blood.
http://hes.ucf.k12.pa.us/gclaypo/circdia.html
http://hes.ucf.k12.pa.us/gclaypo/circdia.html